Speak to a companion on the other side of the room loud and clear through this architectural anomaly.

A cave 150 feet beneath Kansas City is the perfect climate for growing 10,000 delicate orchids.

The world's largest collection of fine-scale miniatures and one the nation's largest collections of antique toys.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

The secret city built by the Manhattan Project.

A theme park attraction designed to turn your children into LARPers.

Less a museum than a bizarre fantasy world created by artists and engineers.

Planes, trains, and automobiles have all been sunk as attractions at this Illinois diving spot.

While he no longer has an eatery to give him context, this off-brand Paul Bunyan still holds his giant hot dog with pride.

Known as the "Cross At The Crossroads," this massive metal cross is just short enough to avoid the FAA.

Even with its slightly risible name this colossal cross is still able to inspire awe.

Giant granite rocks standing end-to-end like a train of circus elephants.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

Oversized statues are just the tip of this nostalgic Americana roadside attraction.

Entombed in this strange, white stone hill are the deadly remains of radioactive weapons production.

Quirky water tower advertises the long-gone Brooks Tomato Products Co.

What was once a presidential estate is now an exotic menagerie and home to the Budweiser Clydesdales.

Man-made geyser that rises to the exact height of the Gateway Arch.

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.

What was meant to be a temporary exhibit is now a permanent fixture at the St. Louis Zoo filled with beautiful birds.

This is not your typical jungle gym.

A chessmaster's dream destination.

The Magic House provides a beautiful and creative environment for curious youngsters to get their knowledge on.

A creepy sculpture of a decapitated head invites viewers to see St. Louis through its empty eyes.